EMC1184 datasheet(36/48 Pages) MICROCHIP

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Quad Channel 1°C Temperature Sensor with Beta Compensation and 1.8V SMBus Communications

Datasheet

Revision 1.0 (07-11-13)

SMSC EMC1184

DATASHEET

1. Internal Diode reads 71°C and both external diodes read 69°C. Consecutive alert counter for INT

is incremented to 1.

2. Both the Internal Diode and External Diode 1 read 71°C and External Diode 2 reads 68°C.

Consecutive alert counter for INT is incremented to 2 and for EXT1 is set to 1.

3. The External Diode 1 reads 71°C and both the Internal Diode and External Diode 2 read 69°C.

Consecutive alert counters for INT and EXT2 are cleared and EXT1 is incremented to 2.

4. The Internal Diode reads 71°C and both external diodes read 71°C. Consecutive alert counter for

INT is set to 1, EXT2 is set to 1, and EXT1 is incremented to 3.

5. The Internal Diode reads 71°C and both the external diodes read 71°C. Consecutive alert counter

for INT is incremented to 2, EXT2 is set to 2, and EXT1 is incremented to 4. The appropriate status

bits are set for EXT1 and the ALERT / THERM2 pin is asserted. EXT1 counter is reset to 0 and

all other counters hold the last value until the next temperature measurement.

Bit 7 - TIMEOUT - Determines whether the SMBus Timeout function is enabled.



‘0’ (default) - The SMBus Timeout feature is disabled. The SMCLK line can be held low indefinitely

without the device resetting its SMBus protocol.



‘1’ - The SMBus Timeout feature is enabled. If the SMCLK line is held low for more than tTIMEOUT,

the device will reset the SMBus protocol.

Bits 6-4 - CTHRM[2:0] - Determines the number of consecutive measurements that must exceed the

corresponding Therm Limit before the THERM pin is asserted. All temperature channels use this value

to set the respective counters. The consecutive Therm counter is incremented whenever any

measurement exceed the corresponding Therm Limit.

If the temperature drops below the Therm Limit, the counter is reset. If a number of consecutive

measurements above the Therm Limit occurs, the THERM pin is asserted low.

Once the THERM pin has been asserted, the consecutive therm counter will not reset until the

corresponding temperature drops below the Therm Limit minus the Therm Hysteresis value.

The bits are decoded as shown in Table 6.14. The default setting is 4 consecutive out of limit

conversions.

Bits 3-1 - CALRT[2:0] - Determine the number of consecutive measurements that must have an out of

limit condition or diode fault before the ALERT / THERM2 pin is asserted. All temperature channels

use this value to set the respective counters. The bits are decoded as shown in Table 6.14. The default

setting is 1 consecutive out of limit conversion.

Table 6.14 Consecutive Alert / Therm Settings

NUMBER OF CONSECUTIVE OUT OF LIMIT

MEASUREMENTS

(default for CALRT[2:0])

(default for CTHRM[2:0])

EMC1184 Datasheet(PDF) 36 Page - Microchip Technology

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